Cutter head



March 11, 1930.' c. JoH sT oN Y CUTTER HEAD/ Filed July 15. 1 927 Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE LUTHER C. JOHNSTON, OF MORGANTON, NORTH CAROLINA, ASSIGNOR OF ONE-FOURTH T0 J. E. GARRISON AND ONE-FOURTH TO JOE KJELLANDER, BOTH OF BURKE COUNTY, NORTH CAROLINA Application filed July 15,

This invention relates to woodworking machines, and more particularly to cutter heads for shapers.

An object of the invention is to provide an improved and simplified construction of cutter head, having effective means for securely holding and supporting the blades.

A further object is to provide grooved clamping blocks so arranged as to receive blades of uniform rectangular cross-section, and formed from stock steel.

WVith the foregoing and such other objects in view as may hereinafter more fully appear, the invention consists in the construction hereinafter described and claimed, and illustrated in the accompanying drawings, in which:

Figure 1 is a plan of my improved device;

Figure 2 is a side elevation.

Figure 8 is a plan view of part of the holder, with blades removed;

Figs. t and 5 are edge and face views, respectively, of one of the improved clamping blocks which I employ.

Like reference characters indicate like parts throughout the following specification and in the several views in the drawings, in which there is providedthe usual high speed shaft 2 in vertical relation, which shaft is journalled in an apron 3 and carries a cutter head 4 above the apron 3, which apron 3 is preferably metallic. The cutter head is provided with a plurality of knives or blades 17, preferably four blades, which blades are mounted at an angle of substantially from the axis of the shaft 2, and which blades are normally supported by a supporting block 18, which block 18 is pyramidal in shape, with the lower corners of the pyramid cut away at 19, and is provided with cap screw sockets 20 on each of its faces, and with a concentric bore fitting the shaft 2. The block 18 normally supports the four blades to which block the blades may be se cured by means of cap screws 21. A pair of blade clamping disk blocks 22 and 23 are provided with V-shaped channels 24: upon their faces, which channels run together in the form of a square, the channels on the block 22 being larger and having a wider separation CUTTER HEAD 1927. Serial No. 206,100.

than the channels on the block 23 conforming to the angularity of the blades 17 and their mounting. Upon placing the block 18 upon the shaft upon the upper face of the block 22, and then placing the block 23 thereupon, and suitably clamping the same by the usual nut means upon the shaft 2, the four blades are quickly and rigidly held with the corners of the blades fitting into the grooves 24. Heretofore this type of blade has usually been provided with a bevel edge, but because of the angularity of the blade in this instance, the corner of the edge of the blade fits into the channel 24. By reason of the inclined position of the blades in this manner, only a portion of the blade engages the wood to be cut at a time, whereby a better cutting results, especially on cross grains, dispensing with the necessity of sanding.

Having now described my invention, that which I claim to be new, and desire to procure by Letters Patent, is:

1. In combination a shaft, a pair of clamping blocks fitting the shaft, the blocks provided with triangular channels, and blades of rectangular cross section engaging the channels with the blades at an angle to the axis of the shaft.

2. In combination in a cutter head a shaft and pair of blocks fitting the shaft and a third block fitting the shaft, the third block being pyramidal form and the pair of blocks providedwith channels, the channels of one of the blocks being substantially at the base of the pyramid and the channels of the second block substantially at the top of the pyramid, and flat blades resting against the pyramidal block with their edges in said channels.

A cutter head comprising a pair of spaced blocks having parallel faces, said faces having triangular channels of uniform depth throughout formed therein, and cutter blades held between said blocks, each blade consisting of a flat piece, rectangular in crosssection, disposed at an acute angle to the faces of the blocks, whereby the corners of the edges of said blades fit into said triangular channels.

4. A cutter head comprising a pair of spaced blocks having parallel faces, said faces having triangular channels formed therein, and cutter blades held between said blocks, each blade consisting of a flat piece of stock steel plate, having square edges, disposed at an inclination to the faces of the blocks so thatthe corners fit into said triangular channels.

In testimony whereof I affix my signature.

LUTHER C. JOHNSTON. 

